Merrimac Wastewater Treatment Plant
Merrimac, MA · Essex County · Publicly Owned Treatment Works
- Average flow
- 0.28 MGD
- Design flow
- —
- NPDES permit
- MAG580030
- Effective
- Permit expires
- November 2026
- Population served
- 3,993
- CWNS 2022
Merrimac Wastewater Treatment Plant is a publicly owned wastewater treatment works in Merrimac, Essex County, Massachusetts treating an average of 0.28 million gallons per day, serving about 3,993 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit MAG580030 (effective), which expires in November 2026, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
3 verified contacts for Merrimac Wastewater Treatment Plant, with validated emails and direct phone numbers.
Unlock 3 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Merrimac Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Massachusetts
Salisbury · 5 mi away
0.59 MGD
Haverhill · 6 mi away
6.58 MGD
Newburyport · 7 mi away
1.45 MGD
North Andover · 11 mi away
21.7 MGD
Ipswich · 12 mi away
0.5 MGD
Manchester · 21 mi away
0.29 MGD
Salem · 22 mi away
17.57 MGD
Billerica · 22 mi away
2.88 MGD
Merrimac Wastewater Treatment Plant: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated November 7, 2025.